Quick answers
- Which hospitals does Peter S. Johnston work at?
- Medicare's official clinician data lists Peter S. Johnston at 1 hospital: MedStar Saint Mary's Hospital. This is where the clinician works or has privileges; call the hospital to confirm.
- Where does Peter S. Johnston see patients?
- Medicare's clinician data lists 3 practice locations, including Leonardtown, MD, White Plains, MD and Frederick, MD. Call before your visit to confirm the address.
- What is Peter S. Johnston's specialty?
- Medicare lists Orthopedic Surgery as the primary specialty.
- Does Peter S. Johnston accept Medicare assignment?
- Yes. Medicare's clinician data says Peter S. Johnston accepts Medicare assignment (the Medicare-approved amount as full payment for covered services), as of 2026-10-02. Ask the office to confirm before your visit.
- What is the phone number for Peter S. Johnston?
- (301) 475-5555, as listed in official Medicare / NPI Registry data.
- What is Peter S. Johnston's NPI number?
- 1194946095. The NPI (National Provider Identifier) is the clinician's permanent federal ID; you can look it up in the official NPI Registry.
Hospitals where Peter S. Johnston works
Medicare's Facility Affiliation Data lists Peter S. Johnston at these hospitals (updated 2026-10-02). Each hospital page shows its address, phone, emergency services, Medicare rating and all its clinicians.
- MedStar Saint Mary's HospitalLeonardtown, MD · Acute Care Hospital · CCN 210028
Practice locations
Addresses where Peter S. Johnston is enrolled with Medicare (CMS data updated 2026-10-02).
- 23000 Moakley St, Suite 102Leonardtown, MD 20650 (301) 475‑5555
- 4225 Altamont Pl, Suite 101White Plains, MD 20695 (301) 645‑0013
- 86 Thomas Johnson CtFrederick, MD 21702 (301) 694‑8311
Group practices
Medicare enrollment lists Peter S. Johnston as a member of this group (CMS data updated 2026-10-02).
- Centers for Advanced Orthopaedics LLC604 clinicians in the group
Specialties
- Orthopedic Surgeryprimary
Other orthopedic surgeons in Leonardtown
Clinicians with the same Medicare primary specialty in Leonardtown, MD — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Medical school | Wayne State University School Of Medicine |
| Graduation year | 2005 |
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1194946095 |
| Corrections | Report an error or suggest an update → |
Most corrections must be made at the source: clinicians update their NPI Registry record (NPPES) and their Medicare enrollment (PECOS); this page follows the next data release.
Sources
- Facility Affiliation Data — Centers for Medicare & Medicaid Services (CMS), data updated 2026-10-02, retrieved 2026-10-29
- National Downloadable File (Doctors and Clinicians) — CMS, data updated 2026-10-02, retrieved 2026-10-29
- NPI Registry — U.S. Department of Health and Human Services (NPPES), the clinician’s official record
- Medicare Care Compare — official Medicare tool to look up clinicians